1023+1098 = 2121
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=>(\(\frac{7}{4}+\frac{21}{20}+\frac{7}{10}+\frac{1}{2}\))-x=-2015
=>(1,75+1,05+0,7+0,5)-x=-2015
=>4-x=-2015
=>x=4-(-2015)
=>x=2019
(\(\frac{2121}{1212}+\frac{2121}{2020}+\frac{2121}{3030}+\frac{2121}{4242}\)) - x = -2015
=> ( \(\frac{21}{12}+\frac{21}{20}+\frac{21}{30}+\frac{21}{42}\) ) - x = -2015
=> ( \(\frac{7}{4}+\frac{21}{20}+\frac{21}{30}+\frac{1}{2}\) ) - x = -2015
=> ( 1,75 + 1,05 + 0,7 + 0,5 ) - x = -2015
=> 4 - x = -2015
=> x = 4 - ( -2015 )
=> x = 4 + 2015
=> x = 2019
\(\left(\frac{2121}{1212}+\frac{2121}{2020}+\frac{2121}{3030}+\frac{2121}{4242}\right)-x=-2015\)
\(\left(\frac{21}{12}+\frac{21}{20}+\frac{21}{30}+\frac{1}{2}\right)=-2015+x\)
\(\left(\frac{7}{3}+\frac{21}{20}+\frac{7}{10}+\frac{1}{2}\right)=-2015+x\)
\(\left(\frac{140}{60}+\frac{63}{60}+\frac{42}{60}+\frac{30}{60}\right)=-2015+x\)
\(\frac{275}{60}=-2015+x\)
\(\frac{55}{12}+2015=x\)
\(x=\frac{55}{12}+\frac{24180}{12}\)
\(x=\frac{24235}{12}\)
Trả lời:
=2121
HT
=2121 nha